What is the code requirement for combination LWCO and pump controller devices?

The requirement for a second dedicated low water cut-off (LWCO) device when using combination LWCO and pump controller devices stems from safety protocols in various codes, particularly to prevent catastrophic failures in systems like boilers or heating systems. The rationale behind this requirement is primarily centered on ensuring reliable protection against low water conditions, which can lead to overheating, system damage, or even explosion.

By mandating a dedicated LWCO in addition to the pump controller, the system ensures a secondary line of defense. If the primary LWCO fails or malfunctions, the dedicated device serves as a backup to interrupt the operation of the system before any dangerous conditions can develop, thus enhancing operational safety.

This approach also encourages adherence to best practices and standards, promoting the installation of multiple safeguards within the system. The presence of an additional LWCO allows for greater compliance with safety regulations and provides operators with the assurance that their equipment will continue to function safely, even if one component fails.